Rainbow Bearded Dragons

I have noticed after my dragons eat Dubia roaches their poop smells horrible. This smell is very unique and only when feeding dubia roaches. What is wrong with these roaches to cause this.The smell is horrible!!!!! Even the dragons start smelling like that.I only feed roaches here and there to my adults and can tell the difference. something has to be wrong with these roaches.They also cause loose stool.

Anyone else notice this issue and where did you get your dubia from????